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Evaluation of high-temperature pyrolysis and CO2 gasification performance of bituminous coal in an entrained flow gasifier
Journal of the Energy Institute ( IF 5.7 ) Pub Date : 2020-09-30 , DOI: 10.1016/j.joei.2020.09.013
M. Shahabuddin , M.A. Kibria , Sankar Bhattacharya

This study used an entrained flow gasifier to assess the pyrolysis and gasification performance of Bangladeshi Barapukurian bituminous coal. The pyrolysis and CO2 gasification were conducted at temperatures of 1000°C–1400 °C under atmospheric pressure. The carbon conversion, syngas yield and pollutant emissions of coal using two different particle size of 90–106 and 250–300 μm have been analysed under CO2 concentration of 10–80 vol%. Solid residue (char/ash) was analysed by using scanning electron microscopy coupled with energy dispersive X-ray (SEM-EDX) and X-ray diffraction (XRD) methods. Results show that the release of volatile matter increases up to the temperature of 1200 °C. However, the temperature needs to increase at 1400 °C for the complete carbon conversion. Based on the CO/H2 ratio, syngas conditioning is required while using a temperature of 1200 °C or above, especially over the stoichiometric CO2 concentrations. Considering the heating value of syngas for power generation, the use of CO2 should be limited to less than 20% at a temperature of 1200–1400 °C. Particle size is important for carbon conversion but there is no significant impact on the heating value of syngas. Installation of the syngas cleaning system is required to drop the pollutants emission from the ppmv range to the ppbv range.



中文翻译:

气流床气化炉中烟煤的高温热解和CO 2气化性能评价

本研究使用气流床气化炉评估孟加拉国Barapukurian烟煤的热解和气化性能。热解和CO 2气化在大气压下于1000°C–1400°C的温度下进行。在CO 2下分析了两种不同粒径(90–106和250–300μm)的煤的碳转化率,合成气产率和污染物排放浓度为10–80 vol%。通过使用扫描电子显微镜,能量色散X射线(SEM-EDX)和X射线衍射(XRD)方法分析固体残留物(炭/灰)。结果表明,直到1200°C,挥发性物质的释放量才会增加。但是,温度需要在1400°C升高才能完成碳的完全转化。基于CO / H 2比率,需要在使用温度为1200°C或更高的条件下进行合成气调节,尤其是在化学计量的CO 2浓度以上。考虑到用于发电的合成气的热值,使用CO 2在1200–1400°C的温度下应限制在20%以下。粒度对于碳转化很重要,但对合成气的热值没有重大影响。需要安装合成气清洁系统才能将污染物排放量从ppmv范围降低到ppbv范围。

更新日期:2020-09-30
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